baidu palo

be/src/exec/empty_set_node.cpp

@@ -0,0 +1,35 @@
+// Copyright (c) 2017, Baidu.com, Inc. All Rights Reserved
+
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// with the License.  You may obtain a copy of the License at
+//
+//   http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+
+#include "exec/empty_set_node.h"
+
+namespace palo {
+
+EmptySetNode::EmptySetNode(ObjectPool* pool, const TPlanNode& tnode,
+                     const DescriptorTbl& descs)
+    : ExecNode(pool, tnode, descs) {
+}
+
+Status EmptySetNode::get_next(RuntimeState* state, RowBatch* row_batch, bool* eos) {
+  *eos = true;
+  return Status::OK;
+}
+
+}
+